Modification of Schnorr Authentication Protocol Using Modular Codes

Low-orbit Satellite Internet Systems (LOSIS) are used to provide Internet access in any point of the Earth. They can contain more than 2,000 spacecrafts. Thus, several spacecraft can be located in the field of view of the satellite Internet receiver at once. As a result, there is a possibility of imposing someone else's content. This possibility can be eliminated by conducting preliminary authentication of the spacecraft. To do this, we can use Schnorr authentication protocol with high cryptographic strength, which is achieved by performing calculations on a large module (140 or more bits). In order to increase the information security of the LOSIS by reducing the authentication time of the spacecraft, it is proposed to modify Schnorr authentication protocol using MC RNS. These codes allow us to increase the speed of authentication by parallelizing calculations at the level of arithmetic operations. As a result of reducing the time spent on spacecraft identification, the information security of the LOSIS will be increased by reducing the time for the selection of the applicant's signal by the intruder satellite. Therefore, modification of Schnorr authentication protocol based on modular code is an urgent task.